Rock drill feed mechanism



Aug. 28, 1934. A. H. KATTERJOHN 1,971,635

ROCK DRILL FEED MECHANISM F iled March 11, 1929 5 Sheets-Sheet J.

1m a 41m 1111 A. H. KATTERJOHN Aug. 28, 1934.

ROCK DRILL FEED MECHANISM Filed March 11, 1929 5 Sheets-Sheet 2 Aug. 28,, 1934.

A. H. KATTERJOHN ROCK DRILL FEED MECHANISM Filed March 11, 1929 5 Sheets-Sheet 3 157 Karma/01m Aug. 28, 1934. A. H. KATTERJOHN ROCK DRILL FEED MECHANISM F iled March 11, 1929 5 Sheets-Sheet 5 gwuemtoz Patented Aug. 28, 1934 UNITED STATES ROCK DRILL FEED MECHANISM August H. Katterjohn,

Denver, 0010., assignor to Gardner-Denver Company, Denver, 0010., a corporation of Delaware Application March 11,

12 Claims.

The object of the present invention is to provide novel and effective means for feeding a drill to its work, said means materially shortening the overall length of the drill while obtaining a relatively long feeding actionthereof.

In the accompanying drawingsi Figure 1 is a side elevation of the preferred form of construction.

Figure 2 is a rear elevation of the same.

Figure 3 is a top plan View of the rear end portion.

Figure 4 is a longitudinal sectional view of the front portion of the drill.

Figure 5 is a corresponding view of the rear portion, (Figures 4 and 5 together constituting a longitudinal section through the entire structure).

Figures 6 and 7 are sectional views respectively on the lines 6-6 and 7-7 of Figure 4.

Figure 8 is a detail sectional view on the line 8-8 of Figure 6.

t Figure 9 is a sectional view on the line 9-9 of Figure .5.

In the embodiment disclosed, a support is employed in the form of a mounting shell 10 having a cone 11 by which it can be suitably secured. This shell includes a bottom 12 and side walls 13. The upper portions of the side walls are formed on their inner sides with longitudinal grooves constituting guideways l4. Preferably the front end of the shell is reduced and extended, as illustrated at 15, the guideways 14,

however, extending into the reduced end portion.

A rock drill 16 of any desired construction is slidably mounted in the shell 10. In the present construction it is shown as mounted on a carriage 17, which carriage is provided with outstanding flanges 18 that are slidably engaged in the guideways 14 of the shell. This carriage is provided on its underside with spaced racks 19 that are located between the side walls 13 and have their teeth depending.

Secured within the lower portion of the shell, preferably by rivets 20 that pass through the bottom wall 12 of said shell, is a bar 21 that is U-shaped in cross section. The side walls 22 of this bar are in the form of racks having upstanding teeth in opposition to and spaced from the racks 19 on the drill carriage 17.

Secured to the rear end of the shell 10 is a fluid operated motor. A part of this motor is a cylinder 23 having a front head 24 and a rear head 25. The front head is abutted against a shoulder 26 formed within the rear portion of the shell, the shoulder being grooved, as shown at 27 to receive a. flange 28 formed upon the head 24 and constituting a firm abutment between the two members. The cylinder is held in place by side bolts 29 engaged with the rear 1929, Serial No. 346,240

head and with ears 30 formed on the rear end of the shell. The side bolts 29 therefore additionally serve to hold the headsand cylinder 23 in assembled relation. Within the cylinder is a piston 31 mounted on the inner end of a piston rod 32. This piston rod projects through the cylinder head 24 and operates between the side rack walls 22 of the bar 21. Said piston rod is provided at its front end with a terminal head 33 that is slidably guided Within the U- shaped bar 21 and has its upper face recessed as shown at 34 to provide a bearing for a cross shaft 35. The shaft is provided with terminal pinions 36 located on opposite sides of the head 33 and meshing with the opposing racks l9 and 22.

For the purpose of supplying and controlling the supply of motive fluid to the cylinder 23, the rear cylinder head 25 is provided with a transversely disposed valve chamber 3'? in which is journaled a rotatable throttle valve 38 provided with a suitable actuating handle 39. Threaded into the end of the valve chamber 37 is a suitable nipple 40 that can be connected to a source. of fluid under pressure, as for example, compressed air. Leading from opposite sides of the valve chamber 37 are distributing passageways 41 and 42. The passageway .41 as shown in Fig. 5 opens into the rear end of the cylinder 23 behind the piston 31. The passageway 42 leads by means of a pipe 43 to a port 44 in the front cylinder head 24, said port opening into the front end of the cylinder 23 in advance of the piston 31. The valve 38 has a supply port 45 opening through the end adjacent to the supply nipple 40 and through one side of the valve so that when the valve is turned, this port 45 may be made to coinmunicate with either of the passageways 41 and 42. The valve 38 is further provided with 2. Iongitudinal channel 46 formed in the opposite side to that through which the port 45 opens. This channel is adapted to communicate with either passageway 41 or 42, accordingly as the valve is turned, andthus opens these passageways to atmosphere. The arrangement is such, as shown in Figure 9, that when one passageway, as 41, is opened to the supply of motive fluid, the other passageway 42 is opened to atmosphere and vice versa.

Having made clear the structure of the apparatus its operation may be outlined as follows. When the shell is mounted on a suitable support, such as a column or an arm in the well-known manner and the drill is put in operation, air or other motive fluid is admitted into the rear end of the cylinder 23 and behind the piston 31. As a consequence the piston is urged forwardly. This moves the head 33 in a corresponding direction and carries the pinions 36 with it. As these pinions mesh with these relatively stationary racks 22 and with the racks 19 of the movable carriage 17, obviously the carriage and the drill will have a rate of movement double that of the piston 31. Not only is a relatively rapid feed thus provided as compared with the rate of movement of the feed piston 31, but the distance is correspondingly increased. It thus follows that the cylinder may be relatively short as compared to the amount of feed that can be given to the drill. To withdraw the drill from its work it is only necessary to reverse the controlling valve 38, whereupon motive fluid will be admitted to the front end of the cylinder and operate against the front side of the piston while the rear end of the cylinder is opened to atmosphere. A quick return movement can thus be secured.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. The combination with a rock drill shell having means for attachment to a support and having a guideway, of a drill slidable on the guide way, a feed motor for the drill disposed longitudinally of the guideway and comprising a cylinder member fixed to the rear portion of the shell and a reciprocatory piston member movable in the cylinder member, and mechanism operated by the piston member and transmitting motion to the drill whereby the latter is moved at a greater rate of speed than that of the piston.

2. The combination with a rock drill shell having a guideway in its upper face, of a drill slidable on the guideway and having a rack, a rack fixed to the shell in opposition to the rack of the drill, a reciprocatory actuating device mounted on the shell, and a pinion journaled on the actuating device and having substantially diametrically opposite portions respectively meshing with the racks, whereby the drill is moved at a greater rate of speed than that of the actuating device.

3. The combination with a supporting shell having spaced guides on its side walls, of a drill slidable on the guides and having a rack extending longitudinally of the guides and in the shell, a reversely disposed rack in the bottom of the shell, an actuating member movable longitudinally of the shell, and a pinion journaled in the actuating member and meshing with the racks.

4. The combination with a supporting shell having spaced guides on its side walls, of a drill slidable on the guides and having parallel racks extending longitudinally of the guides and in the shell, reversely arranged parallel racks in the bottom of the shell, an actuating member movable longitudinally of the shell on a plane between the racks, and a shaft journaled on the actuating member and having spaced pinions that mesh with said racks.

5. The combination with a supporting shell having spaced guides on its side walls, of a drill slidable on the guides and having a rack extending longitudinally of the guides and in the shell, a reversely disposed rack in the bottom of the shell, an actuating member movable longitudinally of the shell, a pinion journaled on the actuating member and meshing with the racks, a cylinder fixed to the rear end :of the shell and a piston operating in the cylinder and connected to the actuating member.

6. The combination with a guide shell having a guideway in its upper portion and means on its underside for mounting it on a support, of a rock drill slidable in the guideway of the shell, a cylinder secured to the shell and disposed longitudinally thereof, a reciprocatory piston in the cylinder, and means on the shell below the drill and connected to the drill and piston for operating the drill at a greater speed than the speed at which the piston is moved.

'7. The combination with a guide shell having a guideway in its upper portion and means on its underside for mounting it on a support, of a rock drill slidable in the guideway of the shell, a cylinder secured to the rear end of the shell and disposed longitudinally thereof in line with the same, a reciprocatory piston in the cylinder, and means on the shell below the drill and connected to the drill and piston for operating the drill at a greater speed than the speed at which the piston is moved.

8. The combination with a-rock drill support having a guideway in its upper face, of a rock drill slidable in the guideway, a feed motor for the drill comprising a cylinder member and a piston member movable therein, said motor being disposed longitudinally of the guideway, one of said members being fixed to the support, the other being movable with respect thereto, and mechanism including a part of the support and a part of the drill engageable by the movable member to move the drill at a greater rate of speed than that of said member.

9. The combination with a rock drill support having a guideway in its upper face, of a rock drill slidable in the guideway to and from its work, and fluid actuated means connected to the support and having an element positioned between the support and drill and engageable therewith for moving the drill at a greater rate of speed than that of the element.

10. The combination with a supporting shell, of a rock drill slidable thereon, a rack on the shell, a rack on the drill, a feed motor mounted uponthe shell, said motor having a movable element, and said movable element being engaged with both racks for moving the drill to and from its work.

11. The combination with a rock drill support having a guideway in its upper face, of a rOck drill slidable in the guideway to and from its Work, and fluid actuated means connected to the support and having an element movable between the support and drill and active thereupon for moving the drill at a greater rate of speed than that of the element.

12. The combination with a rock drill support having a guideway in its upper face, of a rock drill slidable in the guideway to and from its work, fluid actuated means connected to the support and having an element positioned between the support and drill, and a second means connecting the element with the support and drill for moving the drill at a greater rate of speed than that of the element.

AUGUST H. KATTERJOHN. 

